openExposureFusion refers to open-source software pipelines and tools built upon the breakthrough Multi-Exposure Fusion (MEF) algorithm originally conceptualized by Tom Mertens, Jan Kautz, and Frank Van Reeth. Unlike traditional High Dynamic Range (HDR) photography, which generates a heavy 32-bit intermediate file that must then be forcefully compressed through tone mapping, openExposureFusion skips the middleman. It extracts the “perfectly exposed” pixels from a bracketed sequence of photos and weaves them directly into a standard, ready-to-view Low Dynamic Range (LDR) image instantly. The Core Processing Framework
The reason the framework delivers clean, natural-looking photos instantly comes down to how it scores and blends pixels across three criteria:
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